Ocean

Preschool and Kindergarten Ocean and Ocean Animals Crafts, Activities, Lessons, Games, and Printables. Oceans are very important to us. They cover about 70 percent of the Earth's surface and contain about 97 percent of the Earth's water supply. They have the tallest mountains and the deepest valleys. Oceans affect weather and temperature, provide food, and it is estimated that between 70 and 80 percent of our oxygen is produced by marine plants.